When polled, how many Muslims freely acknowledge that they approve of Isis?
4% of Indonesians have a favorable opinion of Isis. That's 250M x 0.04 = 10 million Isis supporters.
8% of Turks have a favorable opinion of Isis. That's 75M x 0.08 = 6 million Isis supporters.
11% of Malaysians have a favorable opinion of Isis. That's 30M x 0.11 = 3 million Isis supporters.
9% of Pakistanis have a favorable opinion of Isis. That's 182M x 0.09 = 16 million Isis supporters.
So, the "good news" is that in just four Muslim majority countries there are 35 million supporters of Isis.
Source (link to to Pew Research website):
In nations with significant Muslim populations, much disdain for ISIS